Subject: Re: [harryproa] 18m Proa Update
From: Rick Willoughby
Date: 2/16/2012, 4:19 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Peter

Regarding your comment about the water off the bow soaking everyone.  This is incorrect.  The spray does not even get near the steering position on the lw side.  Very rarely the ww hull will pick up a bit of spray.  If you go through the clip I occasionally film the leading bow of the ww hull to compare with the lw hull.  The ww bows do not lift watrer. 

The bows of the hull are crush zones of foam about 1m long.  They were sculptured by the owner to what looks pleasing and blend into the bulkheads but they do not shed water very well due to the rake.  Instead they actually lift the water.  They could be reshaped to avoid this.  It would be something to consider if the boat was being raced because I think the volume of water coming up will be unacceptable above 15kts.  I also think it makes the boat prone to pitchpole under certain circumstances.

The most severe motion on the 18m proa I have experienced is when steering with the leading rudder and helm is turned the wrong way and then corrected fast.  The resulting shimmy can make you stumble if you are not braced.  Otherwise you can walk around with ease.  

Doing 10kts in 10-15kts of wind does not involve ploughing through huge waves.  Wave height will usually be no more than 1 to 1.5m and the proa is not bothered by waves of this size.  The outboard bracket (it is a 60HP outboard) sometimes clips waves because it cannot be raised above the deck well on the ww side.  Clearance of the deck on the lw side is 1.2m at rest.  The beams rarely clip waves in the conditions we have experienced to date.

The waves in the video I posted would be close to fully developed for the conditions.  During the middle sections of the video we had a fetch of about 8nm and wind had been blowing at the same strength for hours.

I would not be confident racing this boat as it has some gear weaknesses.  Also I have determined the rudder stocks will be close to yielding with full sail and beating into a 20+kt wind.

Rick

On 17/02/2012, at 2:21 AM, Peter MacLean wrote:

 

HI,
Some time ago I was sailing to Bermuda on a cat and I was in my bunk awake because the boat was crashing through the waves. My son who was fourteen at the time was at the Helm , bugeyed and  staring at the knotmeter ,a big smile on his face as he tried to get that last bit of speed. Unfortuneatly it was a rough ride for the boat and its other occupants. In addition you do not want anything to let go 300 miles offshore.

I met a gentleman with an Atlantic 55, who took it south every winter and I asked him if
had many 250 mile days . He smiled and said hardly any. While the boat was quick to do 10 knots in light conditions , for the most part he spent his time trying to slow the boat down.

A couple of years ago, Isailed up to Beaufort from Fort Lauderdale leaving Mon evening and arriving friday, There were two of us and we stayed in the stream and had some 180 mile days . Pretty good for a L380. We were quite comfortable but we were at our limits.

So, if your out for a day, speed is fun- on a passage not so much , though the dream of a fast passage can stay alive.

It is nice to see an 18m Hp sailing, I would like to see an elegant solution to the rudder problem and of course the water off the bow soaking everyone does not cut it.
Peter


Peter,

I am curious why you say that anything over 10 kts is useless in a cruising boat. My last cruise on my Maine cat 30 occasionally got over 10 kts and I really wanted it to happen more. There were plenty of times that we had winds in the 15-20 kt range with sea states that would support higher sailing speed without beating you up. For me it was more about how
Much work it was instead of a problem of going too fast. 

- Gardner 

Sent from my iPhone

On Feb 15, 2012, at 1:59 PM, Peter MacLean <maccarr06@yahoo.com> wrote:

 

That's great over 10 knots is useless for a cruising boat anyway, so you won't have to slow her down too much. Peter

--- On Wed, 2/15/12, jhargrovewright2@juno.com <jhargrovewright2@juno.com> wrote:

From: jhargrovewright2@juno.com <jhargrovewright2@juno.com>
Subject: Re: [harryproa] 18m Proa Update
To: harryproa@yahoogroups.com.au
Received: Wednesday, February 15, 2012, 7:58 AM



You are of course correct I input 36 in stead of 24 in my converter..24 kph = about 15 mph. (14.9129086 mph) 

 
---------- Original Message ----------
From: Helmut M�<hmueller@otenet.gr>
To: <harryproa@yahoogroups.com.au>
Subject: Re: [harryproa] 18m Proa Update
Date: Wed, 15 Feb 2012 17:40:48 +0200

 

 

…….24kph are not Wow, 24 mph.......

 


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Rick Willoughby




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